AKG introduced four models in Japan in the new product range called "High Definition", the K142HD ($199), K242HD ($239) semi-open studio headphones and the K172HD ($229), K272HD ($239) closed-back DJ headphones with rotatable ear cup for one-ear monitoring. All models can handle 200mW of power and employ large driver units with ultra-soft velvet earpads.

Specifications (K142HD):
► Frequency response: 18Hz ~ 24kHz
► Nominal impedance: 55Ω
► Sensitivity: 101dB/mW

Specifications (K242HD):
► Frequency response: 15Hz ~ 25kHz
► Nominal impedance: 55Ω
► Sensitivity: 91dB/mW

Specifications (K172HD):
► Frequency response: 18Hz ~ 26kHz
► Nominal impedance: 55Ω
► Sensitivity: 94dB/mW

Specifications (K272HD):
► Frequency response: 16Hz ~ 28kHz
► Nominal impedance: 55Ω
► Sensitivity: 91dB/mW